高性能Ir基阳极双催化层阴离子交换膜电解水

High-performance Ir Based Double Anode Catalyst Layer for Anion Exchange Membrane Water Electrolysis

设计高性能低Ir阳极催化层对阴离子交换膜电解水(AEMWE)商业化发展至关重要。本研究采用催化剂涂覆基底(CCS)方法,构建基于氧化铱(IrO_(2))和碳载铱(IrC)双催化层的阳极结构,提出了一种新型双Ir催化层并提高了AEMWE性能。研究表明,在IrC-IrO_(2)(先喷涂碳载铱,后喷涂氧化铱)催化层中,IrC高度分散特性有利于提高催化层中Ir的利用率,优化了催化层内电子、氢氧根离子的传输。采用商业Pt/C催化剂作为阴极,IrC-IrO_(2)阳极双催化层组装成碱性膜电极,在1 mol/L KOH电解质条件下,2.0 V时IrC-IrO_(2)电极达到了2.31 A/cm^(2)的高电流密度,而且在低浓度电解质以及纯水中依旧保持较高的性能。本研究为碱性膜电解水技术高效催化层的设计提供了参考。

Design of high-performance low-Ir anode catalyst layer is crucial for the commercial development of anion-exchange membrane water electrolysis(AEMWE).In this study,a double catalyst layer structure based on iridium oxide(IrO_(2))and carbon loaded iridium(IrC)was constructed by catalyst coated substrate(CCS)method to improve AEMWE performance.It was found that the IrC-IrO_(2) catalyst layer is beneficial to improve the Ir utilization and optimize the transport of electron and hydroxide ions within the catalyst layer due to the highly dispersed morphology of IrC.High AEMWE current density of 2.31 A/cm^(2) was achieved at 2.0 V under 1 mol/L KOH by combining commercial Pt/C catalyst as cathode and IrC-IrO_(2) double catalyst layer as the anode.High performance was maintained at low electrolyte concentrations as well as in pure water.This study provides an example of the efficient catalyst layer design for AEMWE technology.